Some time in the last month, podman started to depend on a bunch
of external helper binaries: rootlessport, pause, catatonit.
System tests fail without these.
Update the hack/bats script to pass $CONTAINERS_HELPER_BINARIES_DIR
(set to ./bin); podman will then use locally-built helpers. (This
requires https://github.com/containers/common/pull/823 , which as
of this PR is not yet vendored into podman. There is no harm in
merging this while we wait.)
Also: if bats helper is invoked as root, run only once; i.e.,
skip the "rootless" step.
Also (piggybacked): the name of the podman pause image has
changed, from pause to podman-pause. Adjust that in our
teardown so we don't leave droppings.
Signed-off-by: Ed Santiago <santiago@redhat.com>